CN117733365A - Laser cutting system and method with synchronous position output function - Google Patents
Laser cutting system and method with synchronous position output function Download PDFInfo
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- CN117733365A CN117733365A CN202311816949.4A CN202311816949A CN117733365A CN 117733365 A CN117733365 A CN 117733365A CN 202311816949 A CN202311816949 A CN 202311816949A CN 117733365 A CN117733365 A CN 117733365A
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Abstract
The invention belongs to the field of ultra-fast laser cutting numerical control systems, in particular to a laser cutting system with a synchronous position output function and a method thereof, wherein the method comprises the following steps: the upper computer is used for sending the laser processing related information to the main controller in a G code form for processing; the main controller is used for receiving the laser processing related information, analyzing the laser processing related information and controlling the movement of the processing platform; meanwhile, receiving encoder feedback signals of all the shafts fed back by the processing platform, and obtaining the displacement distance of the processing platform according to the encoder feedback signals of all the shafts; pulse signals are sent to the laser according to the displacement distance of the processing platform, the laser is controlled to output a pulse sequence with uniform energy, and then the laser processing position is determined; the laser is used for receiving the pulse signals sent by the main controller and outputting uniform pulse sequences; and the processing platform is used for receiving the motion control signal of the main controller and feeding back the encoder feedback signals of the shafts to the main controller.
Description
Technical Field
The invention belongs to the field of ultra-fast laser cutting numerical control systems, and particularly relates to a laser cutting system and method with a synchronous position output function.
Background
In the field of ultrafast laser cutting, the control scheme of the existing products in the market is to divide each control task into each module, and the control tasks are designed in a modularized mode on the hardware and software structure, and the accuracy of cutting processing can be affected due to the distributed design.
In the prior art, an industrial personal computer is used as a core, a numerical control system only completes motion control, and the functions including a position synchronous output function and other functional modules are completed by adding additional modules outside the numerical control system.
Disclosure of Invention
The invention aims to provide a method of a numerical control system with position synchronous output for ultra-fast laser cutting, which is used for improving the precision of ultra-fast laser processing so as to overcome the defects of the laser cutting system.
The technical scheme adopted by the invention for achieving the purpose is as follows: a laser cutting system with synchronized position output, comprising: the laser device comprises a main controller, a laser device connected with the main controller, an upper computer and a processing platform;
the upper computer is used for sending the laser processing related information to the main controller in a G code form for processing;
the main controller is used for receiving the laser processing related information, analyzing the laser processing related information and controlling the movement of the processing platform according to the laser processing related information; meanwhile, receiving encoder feedback signals of all the shafts fed back by the processing platform, and obtaining the displacement distance of the processing platform according to the encoder feedback signals of all the shafts; pulse signals are sent to the laser according to the displacement distance of the processing platform, the laser is controlled to output a pulse sequence with uniform energy, and then the laser processing position is determined;
the laser is used for receiving the pulse signals sent by the main controller and outputting uniform pulse sequences;
and the processing platform is used for receiving the motion control signal of the main controller and feeding back the encoder feedback signals of the shafts to the main controller through the level conversion circuit.
The main controller is a ZYNQ chip integrating an FPGA and an ARM architecture.
The laser processing related information includes: laser power, pulse frequency, speed of movement, gas type.
The encoder feedback signal is: AB 5V differential signal of the two-axis motion motor.
The main controller includes: the device comprises a PL output end, a PS processing end, an I/O interface, a PWM output port, a network port and a level conversion circuit;
the PS processing end is used for receiving the laser processing related information sent by the upper computer through the network port, analyzing the laser processing related information and moving a control instruction to the processing platform through the network port according to the laser processing related information;
the PL processing end is used for receiving encoder feedback signals of all the shafts fed back by the processing platform and acquiring displacement of the processing platform according to the encoder feedback signals of all the shafts; according to the displacement of the processing platform, pulse signals are sent to the laser through the PWM output port, and the laser is controlled to output a uniform pulse sequence;
the PL output end and the PS processing end are connected through a built-in AXI bus;
the PL output end is connected with an I/O interface for connecting a touch screen, a vision module and monitoring and detecting equipment.
A method of a laser cutting system with synchronized position output, comprising the steps of:
1) The upper computer sends the related information of laser processing to the main controller in the form of G codes;
2) The main controller receives and analyzes the laser processing related information, and performs motion control on the processing platform according to the laser processing related information;
3) The two-axis motion motor of the processing platform rotates, and an encoder arranged on the processing platform feeds back an AB 5V differential signal of the two-axis motion motor to the level conversion circuit;
4) The main controller receives the encoder feedback signal converted by the level conversion circuit and obtains the displacement distance of the processing platform according to the encoder feedback signal;
5) The main controller sends pulse signals according to the moving state and the current position of the processing platform to control the output pulse sequence of the laser, so that the laser is uniformly dotted in space.
The step 4) comprises the following steps:
(1) PL output end in the main controller carries out jitter elimination treatment on the collected 3.3V single-ended AB signal;
(2) Processing through the PL output end, and calculating and collecting single-ended AB signals to obtain the moving distance of the platform;
(3) And comparing the movement of the processing platform with the set output interval, and finally outputting the position synchronous pulse sequence.
The method comprises the following steps of:
a) The circumference of the gear is obtained, namely, the motor rotates for one circle for a distance:
gear circumference = modulus x number of teeth x slope x reduction ratio x pi;
wherein, the modulus, the tooth number, the slope and the reduction ratio are all the known quantities set at the PL output end;
b) Obtaining the pulse number of the encoder according to the acquired single-ended AB signal, and calculating the displacement distance of a single pulse according to the pulse number of the encoder and the circumference of the gear obtained in the step a), namely:
single pulse displacement = gear circumference/total pulse number
c) The displacement of the single axis is obtained from the displacement of the single pulse, namely:
uniaxial displacement = uniaxial pulse count × monopulse displacement
d) And obtaining the displacement of the processing platform according to the single-axis displacement.
Comparing the movement of the processing platform with a set output interval, and finally outputting a position synchronous pulse sequence, wherein the method specifically comprises the following steps:
when the displacement of the processing platform reaches a set value, the PL end sends a pulse signal to the laser through the PWM output port to obtain a pulse sequence which enables the output energy of the laser to be uniform; and further determining the laser processing position.
The invention has the following beneficial effects and advantages:
1. according to the invention, each functional module is respectively realized in the ZYNQ, and the position synchronous output function is realized at the PL end of the ZYNQ, and as the interior of the ZYNQ is connected by adopting a high-speed AXI bus, the transmission rate is high, and the characteristics of parallel processing of the FPGA can be used for timely controlling the pulse sequence of the ultra-fast laser, so that the energy output of the ultra-fast laser is uniform during cutting, and the expected cutting effect is achieved.
2. The main controller is a ZYNQ chip, the ZYNQ chip integrates position synchronous output into the numerical control system, the displacement of the platform is judged by collecting feedback signals of the encoder, and then the pulse sequence of the ultrafast laser is controlled to uniformly output, so that the cutting accuracy is ensured.
Drawings
FIG. 1 is a flow chart of the laser cutting system with synchronized position output according to the present invention.
Fig. 2 is a block diagram of the overall hardware connections of the present invention.
Fig. 3 is a block diagram of IP configuration software for the ZYNQ processing system.
Fig. 4 is a diagram of network signal pins according to the present invention.
Fig. 5 is a flowchart of a position synchronous output module according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
The invention uses ZYNQ 7Z020 core board and uses ZYNQ-7000SoC dual-core platform to study the real-time performance of the embedded multi-core system: the platform adopting the dual-core architecture in the multi-core processor can keep lower power consumption, and the dual-core processor can well perform high-speed data processing on one hand, and can respond to external signals in time on the other hand. In this case, the dual core processor can exert great advantages.
FIG. 2 is a block diagram of the overall hardware connections of the present invention;
the invention relates to an industrial personal computer running upper computer software which carries out information transmission and data exchange with a numerical control system through a network, the numerical control system sends a motion command to a motion AXIs through the network, an XY AXIs servo encoder feedback signal is collected by a PL section of the numerical control system after passing through a level conversion circuit, the control of an ultrafast laser and peripheral equipment is realized by a PL end of the system, and PS and PL of the system are connected through a built-in high-speed AXI bus to carry out data interaction.
Specifically, the invention provides a laser cutting system with a synchronous position output function, which comprises: the laser device comprises a main controller, a laser device connected with the main controller, an upper computer and a processing platform;
the upper computer is used for sending the laser processing related information to the main controller in a G code form for processing;
the main controller is used for receiving the laser processing related information, analyzing the laser processing related information and controlling the movement of the processing platform according to the laser processing related information; meanwhile, receiving encoder feedback signals of all the shafts fed back by the processing platform, and obtaining the displacement distance of the processing platform according to the encoder feedback signals of all the shafts; pulse signals are sent to the laser according to the displacement distance of the processing platform, the laser is controlled to output a pulse sequence with uniform energy, and then the laser processing position is determined;
the laser is used for receiving the pulse signals sent by the main controller and outputting uniform pulse sequences;
and the processing platform is used for receiving the motion control signal of the main controller and feeding back the encoder feedback signals of the shafts to the main controller through the level conversion circuit.
The main controller is a ZYNQ chip integrating an FPGA and an ARM architecture;
a main controller, comprising: the device comprises a PL output end, a PS processing end, an I/O interface, a PWM output port, a network port and a level conversion circuit;
the PS processing end is used for receiving the laser processing related information sent by the upper computer through the network port, analyzing the laser processing related information and moving a control instruction to the processing platform through the network port according to the laser processing related information;
the PL processing end is used for receiving encoder feedback signals of all the shafts fed back by the processing platform and acquiring displacement of the processing platform according to the encoder feedback signals of all the shafts; according to the displacement of the processing platform, pulse signals are sent to the laser through the PWM output port, and the laser is controlled to output a uniform pulse sequence;
the PL output end and the PS processing end are connected through a built-in AXI bus;
the PL output end is connected with an I/O interface for connecting a touch screen, a vision module and a monitoring detection device.
Laser processing related information, comprising: laser power, pulse frequency, speed of movement, gas type.
The encoder feedback signal is: AB 5V differential signal of the two-axis motion motor.
As shown in fig. 1, in the working flow chart of the laser cutting system with the synchronous position output function, after the initialization of the program is completed, the numerical control system processes the processing related information and generates interpolation data, the master station program is responsible for packaging and sending the interpolation file, and finally, the slave station executes the command sent by the master station. The method specifically comprises the following steps:
1) The upper computer sends the related information of laser processing to the main controller in the form of G codes;
2) The main controller receives and analyzes the laser processing related information, and performs motion control on the processing platform according to the laser processing related information;
3) The two-axis motion motor of the processing platform rotates, and an encoder arranged on the processing platform feeds back an AB 5V differential signal of the two-axis motion motor to the level conversion circuit;
4) The main controller receives the encoder feedback signal converted by the level conversion circuit and obtains the displacement distance of the processing platform according to the encoder feedback signal;
(1) PL output end in the main controller carries out jitter elimination treatment on the collected 3.3V single-ended AB signal;
(2) Processing through the PL output end, and calculating and collecting single-ended AB signals to obtain the moving distance of the platform;
a) The circumference of the gear is obtained, namely, the motor rotates for one circle for a distance:
gear circumference = modulus x number of teeth x slope x reduction ratio x pi;
wherein, the modulus, the tooth number, the slope and the reduction ratio are all the known quantities set at the PL output end;
b) Obtaining the pulse number of the encoder according to the acquired single-ended AB signal, and calculating the displacement distance of a single pulse according to the pulse number of the encoder and the circumference of the gear obtained in the step a), namely:
single pulse displacement = gear circumference/total pulse number
c) The displacement of the single axis is obtained from the displacement of the single pulse, namely:
uniaxial displacement = uniaxial pulse count × monopulse displacement
d) And obtaining the displacement of the processing platform according to the single-axis displacement.
(3) And comparing the movement of the processing platform with the set output interval, and finally outputting the position synchronous pulse sequence.
Comparing the movement of the processing platform with the set output interval, and finally outputting a position synchronous pulse sequence, wherein the method specifically comprises the following steps:
when the displacement of the processing platform reaches a set value, the PL end sends a pulse signal to the laser through the PWM output port to obtain a pulse sequence which enables the output energy of the laser to be uniform; and further determining the laser processing position.
5) The main controller sends pulse signals according to the moving state and the current position of the processing platform to control the output pulse sequence of the laser, so that the laser is uniformly dotted in space.
As shown in fig. 3, an IP configuration of the ZYNQ processing system; the AXI_HP channel is used for sending data from the PL end to the PS end and writing the data into the DDR, or reading the data in the DDR to the PL end for processing. And the AXI_GP channel is used for the ARM processor to configure the IP core of the PL terminal. The DDR memory controller is configured according to the model of the DDR memory chip, and is configured as the model of MT41K256M16 RE-125. And enabling FCLK_CLK at a clock configuration interface, setting FCLK_CLK0 to 1000MHz clock for rapid transmission of data according to the structure of a PHY chip and the transmission requirement of a gigabit Ethernet, and setting FCLK_CLK1 to 50MHz clock for an ARM processor to configure an IP core at a PL end through an AXI-Lite interface. And opening an interrupt interface between the PL terminal and the PS terminal for the system to send out an interrupt application. I/O peripherals are added for reserved interface usage.
As shown in fig. 4, in the network signal pin diagram of the present invention, pins of the Enet0 module are associated with the PHY chip, where MIO16 to MIO21 pins of the Enet0 are transmit pins, MIO16 is a transmit clock, MIO17 to MIO21 are transmit data pins, and MIO21 is a transmit control pin. The MIO22 to MIO27 pins of Enet0 are the receiving end pins, MIO22 is the receiving end clock, MIO23 to MIO226 is the transmitting data pin, and MIO27 is the receiving end control pin. IO Type is LVCMOS1.8V, speed is fast, and Pullup is enabled. The reference clock frequency of ENET0 is set to 25MHz.
In summary, by configuring the ZYNQ platform, the ultra-fast laser can be ensured to uniformly output along with movement without receiving the influence of acceleration and deceleration of the platform, thereby ensuring the cutting effect.
Although specific embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications and substitutions may be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. A laser cutting system with synchronized position output, comprising: the laser device comprises a main controller, a laser device connected with the main controller, an upper computer and a processing platform;
the upper computer is used for sending the laser processing related information to the main controller in a G code form for processing;
the main controller is used for receiving the laser processing related information, analyzing the laser processing related information and controlling the movement of the processing platform according to the laser processing related information; meanwhile, receiving encoder feedback signals of all the shafts fed back by the processing platform, and obtaining the displacement distance of the processing platform according to the encoder feedback signals of all the shafts; pulse signals are sent to the laser according to the displacement distance of the processing platform, the laser is controlled to output a pulse sequence with uniform energy, and then the laser processing position is determined;
the laser is used for receiving the pulse signals sent by the main controller and outputting uniform pulse sequences;
and the processing platform is used for receiving the motion control signal of the main controller and feeding back the encoder feedback signals of the shafts to the main controller through the level conversion circuit.
2. The laser cutting system with synchronous position output function according to claim 1, wherein the main controller is a ZYNQ chip integrating FPGA and ARM architecture.
3. The laser cutting system with synchronized position output of claim 1, wherein the laser machining related information comprises: laser power, pulse frequency, speed of movement, gas type.
4. The laser cutting system with synchronized position output of claim 1, wherein the encoder feedback signal is: AB 5V differential signal of the two-axis motion motor.
5. A laser cutting system with synchronized position output function according to claim 1 or 2, wherein the main controller comprises: the device comprises a PL output end, a PS processing end, an I/O interface, a PWM output port, a network port and a level conversion circuit;
the PS processing end is used for receiving the laser processing related information sent by the upper computer through the network port, analyzing the laser processing related information and moving a control instruction to the processing platform through the network port according to the laser processing related information;
the PL processing end is used for receiving encoder feedback signals of all the shafts fed back by the processing platform and acquiring displacement of the processing platform according to the encoder feedback signals of all the shafts; according to the displacement of the processing platform, pulse signals are sent to the laser through the PWM output port, and the laser is controlled to output a uniform pulse sequence;
the PL output end and the PS processing end are connected through a built-in AXI bus;
the PL output end is connected with an I/O interface for connecting a touch screen, a vision module and monitoring and detecting equipment.
6. A method of a laser cutting system with synchronized position output according to claim 1, comprising the steps of:
1) The upper computer sends the related information of laser processing to the main controller in the form of G codes;
2) The main controller receives and analyzes the laser processing related information, and performs motion control on the processing platform according to the laser processing related information;
3) The two-axis motion motor of the processing platform rotates, and an encoder arranged on the processing platform feeds back an AB 5V differential signal of the two-axis motion motor to the level conversion circuit;
4) The main controller receives the encoder feedback signal converted by the level conversion circuit and obtains the displacement distance of the processing platform according to the encoder feedback signal;
5) The main controller sends pulse signals according to the moving state and the current position of the processing platform to control the output pulse sequence of the laser, so that the laser is uniformly dotted in space.
7. The method of claim 6, wherein said step 4) comprises the steps of:
(1) PL output end in the main controller carries out jitter elimination treatment on the collected 3.3V single-ended AB signal;
(2) Processing through the PL output end, and calculating and collecting single-ended AB signals to obtain the moving distance of the platform;
(3) And comparing the movement of the processing platform with the set output interval, and finally outputting the position synchronous pulse sequence.
8. The method of claim 7, wherein the step of processing the single-ended AB signal through the PL output and calculating the distance of movement of the platform comprises the steps of:
a) The circumference of the gear is obtained, namely, the motor rotates for one circle for a distance:
gear circumference = modulus x number of teeth x slope x reduction ratio x pi;
wherein, the modulus, the tooth number, the slope and the reduction ratio are all the known quantities set at the PL output end;
b) Obtaining the pulse number of the encoder according to the acquired single-ended AB signal, and calculating the displacement distance of a single pulse according to the pulse number of the encoder and the circumference of the gear obtained in the step a), namely:
single pulse displacement = gear circumference/total pulse number
c) The displacement of the single axis is obtained from the displacement of the single pulse, namely:
uniaxial displacement = uniaxial pulse count × monopulse displacement
d) And obtaining the displacement of the processing platform according to the single-axis displacement.
9. The method of claim 7, wherein comparing the movement of the processing platform with the set output pitch, the final output position synchronization pulse sequence is specifically:
when the displacement of the processing platform reaches a set value, the PL end sends a pulse signal to the laser through the PWM output port to obtain a pulse sequence which enables the output energy of the laser to be uniform; and further determining the laser processing position.
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| CN202311816949.4A CN117733365A (en) | 2023-12-27 | 2023-12-27 | Laser cutting system and method with synchronous position output function |
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